set_material

What set_material does on BlenderMCP

AI agents use set_material to create or update resources in BlenderMCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your BlenderMCP environment.

Why set_material is rated Medium

set_material modifies material properties of existing objects, which is a create/update operation (Write category). It is reversible—properties can be changed back or overwritten. Severity is medium because misuse could affect visual output and scene appearance, but lacks the irreversibility of destructive operations or the code execution risk of execute_blender_code.

From the tool's definition Tool name 'set_material' and description 'Set material properties for an object' indicates modification of object properties in Blender. This is a reversible write operation that changes material attributes but does not create, delete, or execute code.

The rule that runs set_material safely

PolicyLayer is an MCP gateway: it sits between your AI agents and BlenderMCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_material, this is the rule to start with:

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_material": {
      "limits": [
        {
          "counter": "set_material_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

Questions about set_material